/*
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package com.feilong.lib.org.apache.http.protocol;

import java.nio.charset.Charset;

import com.feilong.lib.org.apache.http.Consts;

/**
 * Constants and static helpers related to the HTTP protocol.
 *
 * @since 4.0
 */
public final class HTTP{

    public static final int     CR                       = 13;                        // <US-ASCII CR, carriage return (13)>

    public static final int     LF                       = 10;                        // <US-ASCII LF, linefeed (10)>

    public static final int     SP                       = 32;                        // <US-ASCII SP, space (32)>

    public static final int     HT                       = 9;                         // <US-ASCII HT, horizontal-tab (9)>

    /** HTTP header definitions */
    public static final String  TRANSFER_ENCODING        = "Transfer-Encoding";

    public static final String  CONTENT_LEN              = "Content-Length";

    public static final String  CONTENT_TYPE             = "Content-Type";

    public static final String  CONTENT_ENCODING         = "Content-Encoding";

    public static final String  EXPECT_DIRECTIVE         = "Expect";

    public static final String  CONN_DIRECTIVE           = "Connection";

    public static final String  TARGET_HOST              = "Host";

    public static final String  USER_AGENT               = "User-Agent";

    public static final String  DATE_HEADER              = "Date";

    public static final String  SERVER_HEADER            = "Server";

    /** HTTP expectations */
    public static final String  EXPECT_CONTINUE          = "100-continue";

    /** HTTP connection control */
    public static final String  CONN_CLOSE               = "Close";

    public static final String  CONN_KEEP_ALIVE          = "Keep-Alive";

    /** Transfer encoding definitions */
    public static final String  CHUNK_CODING             = "chunked";

    public static final String  IDENTITY_CODING          = "identity";

    public static final Charset DEF_CONTENT_CHARSET      = Consts.ISO_8859_1;

    public static final Charset DEF_PROTOCOL_CHARSET     = Consts.ASCII;

    /**
     * @deprecated (4.2)
     */
    @Deprecated
    public static final String  UTF_8                    = "UTF-8";

    /**
     * @deprecated (4.2)
     */
    @Deprecated
    public static final String  UTF_16                   = "UTF-16";

    /**
     * @deprecated (4.2)
     */
    @Deprecated
    public static final String  US_ASCII                 = "US-ASCII";

    /**
     * @deprecated (4.2)
     */
    @Deprecated
    public static final String  ASCII                    = "ASCII";

    /**
     * @deprecated (4.2)
     */
    @Deprecated
    public static final String  ISO_8859_1               = "ISO-8859-1";

    /**
     * @deprecated (4.2)
     */
    @Deprecated
    public static final String  DEFAULT_CONTENT_CHARSET  = ISO_8859_1;

    /**
     * @deprecated (4.2)
     */
    @Deprecated
    public static final String  DEFAULT_PROTOCOL_CHARSET = US_ASCII;

    /**
     * @deprecated (4.2)
     */
    @Deprecated
    public final static String  OCTET_STREAM_TYPE        = "application/octet-stream";

    /**
     * @deprecated (4.2)
     */
    @Deprecated
    public final static String  PLAIN_TEXT_TYPE          = "text/plain";

    /**
     * @deprecated (4.2)
     */
    @Deprecated
    public final static String  CHARSET_PARAM            = "; charset=";

    /**
     * @deprecated (4.2)
     */
    @Deprecated
    public final static String  DEFAULT_CONTENT_TYPE     = OCTET_STREAM_TYPE;

    public static boolean isWhitespace(final char ch){
        return ch == SP || ch == HT || ch == CR || ch == LF;
    }

    private HTTP(){
    }

}
